Which symbiotic algae is found in the secretory cells of Hydra?

The symbiotic algae found in the secretory cells of Hydra is known as Euchlorella. This green algae has a mutualistic relationship with the Hydra, providing it with oxygen and some nutrients produced through photosynthesis. In exchange, the Hydra offers a protected environment and access to sunlight, which the algae needs for photosynthesis. This symbiotic relationship is beneficial for both organisms, as the algae can thrive in the Hydra’s cells while contributing to the Hydra’s metabolic needs. Euchlorella’s presence can also give Hydra a greenish tint, indicating the presence of the algae within its cells. This relationship is an example of how different species can work together for mutual benefit.